RAID 1
Disk Mirroring
RAID 1 provides redundancy by writing all data to two or more drives. The performance of a level 1 array tends to be faster on reads and slower on writes compared to a single drive, but if either drive fails, no data is lost. This is a good entry-level redundant system, since only two drives are required; however, since one drive is used to store a duplicate of the data, the cost per megabyte is high. This level is commonly referred to as mirroring.
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Advantages
No parity generation
Easy to implement
Extremely fault tolerant
Utilises full disk capacity
2 drives minimum
Disadvantages
In efficient use of disk space
High disk overhead
Doubles number of writes
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Application
Pre-Press, Video editing and production, Image manipulation/editing
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